Code for VBA Homeworks

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1 Code for VBA Homeworks (HW1point1, HW1point2, HW2, and HW3. See vba-homeworks.xls.) vba-homework-slides.tex. For class on February 15 and 17,

2 Option Explicit Sub HW1point1() Dim AbleStartValue As Double Dim BakerStartValue As Double Dim AbleGrowthRate As Double Dim BakerGrowthRate As Double Dim AbleValue As Double Dim BakerValue As Double Dim Year As Integer Dim Done As Boolean Done = False Year = 0 2

3 AbleStartValue = Worksheets("HW1-1").Cells(2, 2).Value BakerStartValue = Worksheets("HW1-1").Cells(2, 3).Value AbleGrowthRate = Worksheets("HW1-1").Cells(3, 2).Value BakerGrowthRate = Worksheets("HW1-1").Cells(3, 3).Value AbleValue = AbleStartValue BakerValue = BakerStartValue If BakerValue >= AbleValue Then Worksheets("HW1-1").Cells(7, 1).Value = Year Worksheets("HW1-1").Cells(7, 2).Value = AbleStartValue Worksheets("HW1-1").Cells(7, 3).Value = BakerStartValue Exit Sub End If 3

4 Do While Not Done AbleValue = ValueNext(AbleValue, AbleGrowthRate) BakerValue = ValueNext(BakerValue, BakerGrowthRate) Year = Year + 1 If BakerValue >= AbleValue Then Worksheets("HW1-1").Cells(6, 1).Value = Year Worksheets("HW1-1").Cells(6, 2).Value = AbleValue Worksheets("HW1-1").Cells(6, 3).Value = BakerValue Done = True End If Loop MsgBox "Done!" End Sub 4

5 Function ValueNext(oldValue As Double, growthrate As Double) _ As Double ValueNext = oldvalue * (1 + growthrate) End Function 5

6 Option Explicit Sub HW1point2() Dim AbleStartValue As Double Dim BakerStartValue As Double Dim AbleGrowthRate As Double Dim BakerGrowthRate As Double Dim AbleValue As Double Dim BakerValue As Double Dim Year As Integer Dim Done As Boolean Dim StartYear As Integer Dim StopYear As Integer Dim mycounter As Integer 6

7 Done = False mycounter = 0 Year = 0 AbleStartValue = Worksheets("HW1-2").Cells(2, 2).Value BakerStartValue = Worksheets("HW1-2").Cells(2, 3).Value AbleGrowthRate = Worksheets("HW1-2").Cells(3, 2).Value BakerGrowthRate = Worksheets("HW1-2").Cells(3, 3).Value StartYear = Worksheets("HW1-2").Cells(4, 2).Value StopYear = Worksheets("HW1-2").Cells(5, 2).Value 7

8 ' Clear those parts of the spreadsheet as needed. ActiveSheet.Range(Cells(12, 1), Cells(12 + StopYear, 3)).Select Selection.Clear Cells(1, 1).Select 8

9 AbleValue = AbleStartValue BakerValue = BakerStartValue If BakerValue >= AbleValue Then Worksheets("HW1-2").Cells(7, 1).Value = Year Worksheets("HW1-2").Cells(7, 2).Value = AbleValue Worksheets("HW1-2").Cells(7, 3).Value = BakerValue Exit Sub End If 9

10 For Year = StartYear To StopYear AbleValue = ValueInYear(AbleStartValue, AbleGrowthRate, Year) BakerValue = ValueInYear(BakerStartValue, BakerGrowthRate, Year mycounter = mycounter + 1 Worksheets("HW1-2").Cells(11 + mycounter, 1).Value = Year Worksheets("HW1-2").Cells(11 + mycounter, 2).Value = AbleValue Worksheets("HW1-2").Cells(11 + mycounter, 3).Value = BakerValue If BakerValue >= AbleValue Then Worksheets("HW1-2").Cells(7, 1).Value = Year Worksheets("HW1-2").Cells(7, 2).Value = AbleValue Worksheets("HW1-2").Cells(7, 3).Value = BakerValue ' Put in formatting Range(Cells(12, 2), Cells(11 + mycounter, 3)).Select Selection.Style = "Currency" Cells(1, 1).Select 10

11 ' Put in termination indicators mycounter = mycounter + 1 Worksheets("HW1-2").Cells(11 + mycounter, 1).Value = "******" Worksheets("HW1-2").Cells(11 + mycounter, 2).Value = "******" Worksheets("HW1-2").Cells(11 + mycounter, 3).Value = "******" MsgBox "Found it." Exit Sub End If Next Year 11

12 Worksheets("HW1-2").Cells(7, 1).Value = "?" Worksheets("HW1-2").Cells(7, 2).Value = "?" Worksheets("HW1-2").Cells(7, 3).Value = "?" ' Put in formatting Range(Cells(12, 2), Cells(11 + mycounter, 3)).Select Selection.Style = "Currency" Cells(1, 1).Select MsgBox "Didn't find it!" End Sub 12

13 Function ValueInYear(startValue As Double, _ growthrate As Double, theyear As Integer) As Double ValueInYear = startvalue * (1 + growthrate) ^ theyear End Function 13

14 Option Explicit Sub HW2point1() Dim I As Integer Dim Vector1Length As Integer Dim Vector2Length As Integer Dim Vector1() As Double Dim Vector2() As Double Vector1Length = ActiveSheet.Range("Vector1").Rows.Count Vector2Length = ActiveSheet.Range("Vector2").Rows.Count If Vector1Length <> Vector2Length Then MsgBox "Sorry, the two vectors must have " _ & "the same length. Quitting." Exit Sub End If 14

15 ReDim Vector1(1 To Vector1Length) As Double ReDim Vector2(1 To Vector2Length) As Double For I = 1 To Vector1Length Vector1(I) = Range("Vector1").Cells(I).Value Vector2(I) = Range("Vector2").Cells(I).Value ActiveSheet.Cells(3, 4).Value = HW2DotProduct(Vector1, Vector2) End Sub Function HW2DotProduct(Vector1() As Double, _ Vector2() As Double) As Double ' Note: (Vector1, Vector2) would also work. Dim I As Integer Dim J As Integer Dim VectorLength As Integer 15

16 Dim SumSoFar As Double ' Assume that both vectors go from 1 to something. ' What's that something? I = UBound(Vector1) J = UBound(Vector2) ' Now some extra checking... If I <= J Then VectorLength = I Else VectorLength = J End If SumSoFar = 0 For I = 1 To VectorLength SumSoFar = SumSoFar + (Vector1(I) * Vector2(I)) HW2DotProduct = SumSoFar End Function 16

17 Sub HW2point2() Dim I As Integer Dim Position As Integer Dim Vector1() As Integer Dim Vector1Length As Integer Position = ActiveSheet.Range("position").Value Vector1Length = ActiveSheet.Range("ToFlip").Rows.Count ReDim Vector1(1 To Vector1Length) As Integer ' Some error checking: For I = 1 To Vector1Length Vector1(I) = Range("ToFlip").Cells(I).Value If Not (Vector1(I) = 1 Or Vector1(I) = 0) Then MsgBox "Require a 0-1 vector. Quitting." Exit Sub End If 17

18 If Position > Vector1Length Or _ Position < 1 Or Not IsNumeric(Position) Then MsgBox "Not a valid position. Quitting." Exit Sub End If Call FlipABit(Vector1, Position) For I = 1 To Vector1Length Range("Flipped").Cells(I).Value = Vector1(I) End Sub 18

19 Sub FlipABit(Vector() As Integer, Position As Integer) If Vector(Position) = 1 Then Vector(Position) = 0 Else Vector(Position) = 1 End If End Sub 19

20 Sub HW2point3() Dim Low As Integer Dim High As Integer Dim Draw As Integer Low = Range("Low").Value High = Range("High").Value ' No error checking here! Draw = LowHighRandomInt(Low, High) Range("Draw").Value = Draw End Sub Function LowHighRandomInt(L As Integer, H As Integer) As Integer LowHighRandomInt = Int(Rnd() * (H - L + 1) + L) End Function 20

21 Sub HW2point4() Dim Low As Integer Dim High As Integer Dim Rows As Integer Dim Columns As Integer Dim TheArray() As Integer Low = Range("Low").Value High = Range("High").Value Rows = Range("Rows").Value Columns = Range("Columns").Value ' No error checking here! ReDim TheArray(1 To Rows, 1 To Columns) As Integer Call ArrayRandomFill(TheArray, Low, High) Dim I As Integer Dim J As Integer 21

22 For I = 1 To UBound(TheArray, 1) For J = 1 To UBound(TheArray, 2) ActiveSheet.Cells(I + 33, J + 1).Value = TheArray(I, J) Next J End Sub Sub ArrayRandomFill(OurArray() As Integer, _ LowInt As Integer, HighInt As Integer) Dim I As Integer Dim J As Integer For I = 1 To UBound(OurArray, 1) For J = 1 To UBound(OurArray, 2) OurArray(I, J) = LowHighRandomInt(LowInt, HighInt) Next J End Sub 22

23 Sub HW2point5() Dim TwoDArray() As Integer Dim RowSums() As Integer Dim NormalizedSums() As Double Dim I As Integer Dim j As Integer ReDim TwoDArray(1 To Range("HW2point5TestArray").Rows.Count, _ 1 To Range("HW2point5TestArray").Columns.Count) As Integer ReDim RowSums(1 To UBound(TwoDArray, 1)) As Integer ReDim NormalizedSums(1 To UBound(TwoDArray, 1)) As Double 23

24 For I = 1 To UBound(TwoDArray, 1) For j = 1 To UBound(TwoDArray, 2) TwoDArray(I, j) = Range("HW2point5TestArray").Cells(I, j).value Next j ' Calculate the row sums and write them on the worksheet. Call Sum2DRows(TwoDArray, RowSums) For I = 1 To UBound(TwoDArray, 1) Range("RowSums").Cells(I).Value = RowSums(I) ' Normalize the row sums. Call NormalizeRowSums(RowSums, NormalizedSums) 24

25 Dim AZeroOneRV As Double AZeroOneRV = Rnd() Dim RowSelected As Integer Call SelectARow(NormalizedSums, AZeroOneRV, RowSelected) Range("rowpicked").Value = RowSelected End Sub 25

26 Sub Sum2DRows(AnArray() As Integer, ReturnArray() As Integer) Dim I As Integer Dim j As Integer For I = 1 To UBound(ReturnArray) ReturnArray(I) = 0 For I = 1 To UBound(AnArray, 1) For j = 1 To UBound(AnArray, 2) ReturnArray(I) = ReturnArray(I) + AnArray(I, j) Next j End Sub 26

27 Sub NormalizeRowSums(TheSums() As Integer, _ TheSumsNormalized() As Double) Dim TempSum As Double Dim I As Integer TempSum = 0 For I = 1 To UBound(TheSums) TempSum = TempSum + TheSums(I) For I = 1 To UBound(TheSums) TheSumsNormalized(I) = TheSums(I) / TempSum End Sub 27

28 Sub SelectARow(OurNormalizedSums() As Double, _ TheZeroOneRV As Double, TheRowSelected As Integer) Dim ProbSoFar As Double ProbSoFar = 0 Dim I As Integer For I = 1 To UBound(OurNormalizedSums) ProbSoFar = ProbSoFar + OurNormalizedSums(I) If TheZeroOneRV <= ProbSoFar Then TheRowSelected = I Exit Sub End If End Sub 28

29 Sub HW2point6() Dim OneDArray() As Integer Dim probmutation As Double Dim I As Integer ReDim OneDArray(1 To Range("In").Columns.Count) As Integer For I = 1 To UBound(OneDArray) OneDArray(I) = Range("In").Cells(I).Value probmutation = Range("pMutate").Value Call DoMutation(OneDArray, probmutation) For I = 1 To UBound(OneDArray) Range("Out").Cells(I).Value = OneDArray(I) End Sub 29

30 Sub DoMutation(Chromosome() As Integer, WithProb As Double) Dim I As Integer For I = 1 To UBound(Chromosome) If Rnd() <= WithProb Then Call FlipABit(Chromosome, I) End If End Sub 30

31 Sub HW2point7() Dim probcrossover As Double Dim ParentA() As Integer Dim ParentB() As Integer Dim DaughterA() As Integer Dim DaughterB() As Integer Dim I As Integer probcrossover = Range("pXOver").Value ReDim ParentA(1 To Range("ParentA").Columns.Count) ReDim ParentB(1 To Range("ParentB").Columns.Count) ReDim DaughterA(1 To Range("DaughterA").Columns.Count) ReDim DaughterB(1 To Range("DaughterB").Columns.Count) 31

32 For I = 1 To UBound(ParentA) ParentA(I) = Range("ParentA").Cells(I).Value ParentB(I) = Range("ParentB").Cells(I).Value Call DoCrossover(ParentA, ParentB, DaughterA, _ DaughterB, probcrossover) For I = 1 To UBound(ParentA) Range("DaughterA").Cells(I).Value = DaughterA(I) Range("DaughterB").Cells(I).Value = DaughterB(I) End Sub 32

33 Sub DoCrossover(FirstParent() As Integer, _ SecondParent() As Integer, FirstDaughter() As Integer, _ SecondDaughter() As Integer, xoverprob As Double) Dim xoverpoint As Integer Dim I As Integer If Rnd() > xoverprob Then ' We are not doing crossover this time. For I = 1 To UBound(FirstParent) FirstDaughter(I) = FirstParent(I) SecondDaughter(I) = SecondParent(I) Else 33

34 ' We are doing crossover this time. ' Find the point of crossingover. xoverpoint = LowHighRandomInt(1, UBound(FirstParent) - 1) For I = 1 To xoverpoint FirstDaughter(I) = FirstParent(I) SecondDaughter(I) = SecondParent(I) For I = xoverpoint + 1 To UBound(FirstParent) FirstDaughter(I) = SecondParent(I) SecondDaughter(I) = FirstParent(I) End If End Sub 34

35 HW3: IP Sensitivity Option Explicit Sub SensitivityAnalysis() Dim darownumber As Integer Dim XVector(1 To 20) As Integer Dim CVector(1 To 20) As Double Dim WVector(1 To 20) As Double Dim I As Integer Dim DotProductResult As Double Dim davariableindex As Integer Dim W As Double 35

36 Dim BestIndexSoFar As Integer Dim BestZSoFar As Double Dim AllowedSlack As Double Dim CurrentZ As Double Dim CurrentW As Double 'Get the Right-Hand-side value of the contraint W = ActiveSheet.Range("H4").Value 36

37 ' Put the row number selected ' into the column heading. darownumber = Selection.Row ActiveSheet.Range("I3").Value = darownumber davariableindex = darownumber - 3 BestIndexSoFar = davariableindex BestZSoFar = 0 AllowedSlack = ActiveSheet.Range("G2").Value ' Load the vectors For I = 1 To 20 XVector(I) = ActiveSheet.Cells(I + 3, 5).Value CVector(I) = ActiveSheet.Cells(I + 3, 3).Value WVector(I) = ActiveSheet.Cells(I + 3, 4).Value 37

38 ' Change the given XVector, flipping the ' selected position Call FlipVectorPosition(XVector, davariableindex) 38

39 ' Now find the best one-position change from here For I = 1 To 20 If I <> davariableindex Then Call FlipVectorPosition(XVector, I) CurrentZ = DotProduct(CVector, XVector) CurrentW = DotProduct(WVector, XVector) If CurrentZ > BestZSoFar And CurrentW <= W + AllowedSlack Then BestZSoFar = CurrentZ BestIndexSoFar = I End If ' Flip it back Call FlipVectorPosition(XVector, I) End If 39

40 ActiveSheet.Range("J4").Value = BestZSoFar ActiveSheet.Range("J6").Value = BestIndexSoFar Call FlipVectorPosition(XVector, BestIndexSoFar) For I = 1 To 20 ActiveSheet.Cells(I + 3, 9).Value = XVector(I) ActiveSheet.Range("J8").Value = DotProduct(WVector, XVector) End Sub 40

41 Sub FlipVectorPosition(Vector() As Integer, Position As Integer) If Vector(Position) = 1 Then Vector(Position) = 0 Else Vector(Position) = 1 End If End Sub 41

42 Function DotProduct(Vector1, Vector2) As Double Dim I As Integer Dim j As Integer Dim VectorLength As Integer Dim SumSoFar As Double ' Assume that both vectors go from 1 to something. ' What's that something? I = UBound(Vector1) j = UBound(Vector2) If I <= j Then VectorLength = I Else VectorLength = j End If 42

43 SumSoFar = 0 For I = 1 To VectorLength SumSoFar = SumSoFar + (Vector1(I) * Vector2(I)) DotProduct = SumSoFar End Function 43

IDENTIFYING UNIQUE VALUES IN AN ARRAY OR RANGE (VBA)

Date: 20/11/2012 Procedure: Identifying Unique Values In An Array Or Range (VBA) Source: LINK Permalink: LINK Created by: HeelpBook Staff Document Version: 1.0 IDENTIFYING UNIQUE VALUES IN AN ARRAY OR